Inxpect SRE 200 Series - 6.3 Anti-tampering functions: anti-masking

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6. Other functions

Note: when the position is modified with respect to the saved references (i.e., when a sensor is rotated) and the

anti-rotation around axes function is enabled, the Inxpect SRE 200 Series detects the tampering and sends the

message within 5 s.

The sensor can detect changes in rotation around the x-axis and the z-axis even if it is switched off. The tamper

alert is sent to the control unit at the following switch on.

A change in rotation around the y-axis is detected only if it is faster than 5° every 10 s and if the system is on.

WARNING! The tamper alert due to a rotation around the y-axis is reset at the next switch on. For

proper and safe operation of the system, validate the system again.

6.2.2 Enable the anti-rotation around axes function

The anti-rotation around axes function is disabled by default.

WARNING! If the function is disabled, the system cannot signal a change in the rotation of the

sensor around the axes and, therefore, any changes in the monitored area. See "Checks when the

anti-rotation around axes function is disabled" below.

WARNING! Take precautions to prevent tampering, if the function is disabled for at least one axis of

one sensor and if the rotation around that axis is not protected with tamper-proof screws.

The function can be enabled and configured for each axis of each sensor individually. In the Inxpect Safety

application, in Settings > Anti-tampering, click on the specific option to enable the function for a sensor.

6.2.3 When to enable

Enable the anti-rotation around axes function only if it is necessary to detect a change in the rotation of a sensor

around a specific axis.

It is strongly suggested not to enable the function if the sensor is installed on a moving object (e.g., carriage,

vehicle) whose motion could change the sensor inclination (e.g., motion on a slope or in a curve).

6.2.4 Checks when the anti-rotation around axes function is disabled

When the anti-rotation around axes function is disabled, perform the following checks.

Safety function Schedule Action

Access detection

function

Before each machinery restart Check that the sensor is positioned as defined in the

configuration.

Check that the monitored area is the same as defined

by the configuration.

See "Validate the safety functions" on page77.

Restart prevention

function

Each time the safety outputs are

deactivated

6.3 Anti-tampering functions:anti-masking

6.3.1 Masking signal

The sensor detects the presence of objects that could obstruct the field of view. When the system configuration is

saved, the sensor memorizes the surrounding environment. If the sensor subsequently detects variations in the

environment that could influence the field of view, it sends a masking signal to the control unit. The sensor

monitors from -50° to 50° on the horizontal plane regardless of the angular coverage set. Upon receiving a

masking signal, the control unit deactivates the safety outputs.

Note: the masking signal is not guaranteed in the presence of objects which cause reflection effects that bring their

RCS below the minimum detectable threshold.

Note: when the position is modified with respect to the saved references (i.e., when a sensor is masked) and the

anti-rotation around axes function is enabled, the Inxpect SRE 200 Series detects the tampering and notifies it

within 5 s.

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Inxpect SRE 200 Series - 6.3 Anti-tampering functions: anti-masking

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